UnratedFix available

libwebsockets vulnerabilities

Type: advisorySource: OSV1 source record

It was discovered that Libwebsockets incorrectly handled certain SSH protocol messages in its SSH protocol handler. A remote attacker could possibly use this issue to cause Libwebsockets to consume excessive resources, resulting in a denial of service. (CVE-2026-10650) It was discovered that Libwebsockets incorrectly handled certain malformed CBOR data. A remote attacker could possibly use this issue to cause Libwebsockets to crash, resulting in a denial of service, or execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-78161)

Announced 25 Sept 2026Source revision 1

Original source ↗

USN-8822-1

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:USN-8822-1

libwebsockets

Source reference: /affected/0/package/name

Affected versions: 2.0.3-3build1
Source reference: /affected/0/versions
3.2.1-3
Source reference: /affected/0/versions
3.2.1-3ubuntu0.1~esm1
Source reference: /affected/0/versions
Fixed versions: 3.2.1-3ubuntu0.1~esm2
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

libwebsockets

Source reference: /affected/1/package/name

Affected versions: 4.0.20-2
Source reference: /affected/1/versions
4.0.20-2ubuntu1
Source reference: /affected/1/versions
4.0.20-2ubuntu1.1
Source reference: /affected/1/versions
Fixed versions: 4.0.20-2ubuntu1.1+esm1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

libwebsockets

Source reference: /affected/2/package/name

Affected versions: 4.3.2-4
Source reference: /affected/2/versions
4.3.3-1
Source reference: /affected/2/versions
4.3.3-1.1build1
Source reference: /affected/2/versions
4.3.3-1.1build2
Source reference: /affected/2/versions
4.3.3-1.1build3
Source reference: /affected/2/versions
4.3.3-1.1ubuntu0.1~esm1
Source reference: /affected/2/versions
Fixed versions: 4.3.3-1.1ubuntu0.1~esm2
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

libwebsockets

Source reference: /affected/3/package/name

Affected versions: 4.3.5-1
Source reference: /affected/3/versions
4.3.5-3
Source reference: /affected/3/versions
4.3.5-3ubuntu1
Source reference: /affected/3/versions
Fixed versions: 4.3.5-3ubuntu1.1
Source reference: /affected/3/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.2.1-3ubuntu0.1~esm2"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Ffocal",
      "ecosystem": "Ubuntu:Pro:20.04:LTS"
    },
    "versions": [
      "2.0.3-3build1",
      "3.2.1-3",
      "3.2.1-3ubuntu0.1~esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8822-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-10650",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:Pro:20.04:LTS"
      }
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libwebsockets-test-server",
          "binary_version": "3.2.1-3ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-test-server-common",
          "binary_version": "3.2.1-3ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets15",
          "binary_version": "3.2.1-3ubuntu0.1~esm2"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.0.20-2ubuntu1.1+esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Fjammy",
      "ecosystem": "Ubuntu:Pro:22.04:LTS"
    },
    "versions": [
      "4.0.20-2",
      "4.0.20-2ubuntu1",
      "4.0.20-2ubuntu1.1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8822-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-10650",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:Pro:22.04:LTS"
      }
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libwebsockets-test-server",
          "binary_version": "4.0.20-2ubuntu1.1+esm1"
        },
        {
          "binary_name": "libwebsockets-test-server-common",
          "binary_version": "4.0.20-2ubuntu1.1+esm1"
        },
        {
          "binary_name": "libwebsockets16",
          "binary_version": "4.0.20-2ubuntu1.1+esm1"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.3.3-1.1ubuntu0.1~esm2"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Fnoble",
      "ecosystem": "Ubuntu:Pro:24.04:LTS"
    },
    "versions": [
      "4.3.2-4",
      "4.3.3-1",
      "4.3.3-1.1build1",
      "4.3.3-1.1build2",
      "4.3.3-1.1build3",
      "4.3.3-1.1ubuntu0.1~esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8822-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-10650",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          },
          {
            "id": "CVE-2026-78161",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:Pro:24.04:LTS"
      }
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libwebsockets-evlib-ev",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-evlib-glib",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-evlib-uv",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-test-server",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-test-server-common",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets19t64",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.3.5-3ubuntu1.1"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:deb/ubuntu/libwebsockets?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "4.3.5-1",
      "4.3.5-3",
      "4.3.5-3ubuntu1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8822-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-10650",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          },
          {
            "id": "CVE-2026-78161",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:26.04:LTS"
      }
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libwebsockets-evlib-ev",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets-evlib-glib",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets-evlib-uv",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets-test-server",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets-test-server-common",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets19t64",
          "binary_version": "4.3.5-3ubuntu1.1"
        }
      ],
      "availability": "No subscription required"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #22402 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 06:01:02 GMT
Publisher date: Fri, 25 Sep 2026 02:39:11 GMT

Read the original announcement